Water-heater.



H. S. HUMPHEEY.

WATER HEATER.

APPLIUATIM HLED 12` 1967. L 933,862. Panema Nw 17.1908.

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HERBERT S. HUMPHVREY, OF KALAMAZOO, MICHIGAN.

, WATER-HEATER.

' Specification of Letters Patent.

.Patented Nov. 17, 1908` Application led September 12, 1907. Serial No. 392,695.

To all whom 'it muy concern:

Be it known that I, Hnuuen'r S. HUM- PHREY, a citizen of the United States, re-

siding at the city and county of Kalamazoo,l

State of Michi an, have invented certain new and usefu Improvements in Water- Heaters, of which the following as a specification. i

This invention relates to improvements in water heaters.

The main objects of this invention are, vfirst, to provide an improved water heater adapted to automatically'maintain the water in the system, or in the storage tank, at a predetermined temperature, and to permit the drawing of large quantities of water from the system or tank without materially reducing the temperature thereof. Second, to provide in a water heater an improved valve mechanism whereby the supply of gas to the heater burners is automatically controlled both thermostatically and by the drawing oii` of water. Elhird, to provlde 'an improved water heater which is of very lare-capacity and at the same time economica in its use of gas. Fourth, to provide an Yimproved water heater in which the water circulates very freely through the heater.

Further objects, and objects relating to details of construction, will definitely ap- .pear from the detailed descri tion to follow.

I accomplish the objects o my invention by the devices and means described in the following specification. l

The invention is clearly defined and pointed out inthe claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in which,

Figure 1 is a detail side elevation of my improved water heater,the heater casing being shown in vertical section. Fio. 2 is an enlarged detail vertical section taen on a line corresponding to line 2-2 of Fi 1, showing details of the valve mechanism. g.

3 is a detail vertical section taken on a line correspondin to line3-3 of Figs. 2and 4. Fig. 4 is an en'arged section taken on a line correspondin to line 4-4 of Figs. 1 and 3, showing urther details of the valve mechansm, the valve casing being disconnected from the pipes. Fig. 5 is'an enlarged detail taken on a linc-correspomling to thc linc 5--5 of Fir. 3.

In the rawing, the sectional views are taken looking in the direction of the little arrows at the ends of the section lines, and similar numerals of reference refer to similar parts throughout the several views.

Referring to the drawing, the lcasing of my improved heater preferably consists of the hase 1, having an upwardl '-projecting annular fiangc thereon adapte to receive the burner casing 2. The burner casing 2 is provided with air inlet openings 3, and with a shoulder 4 at its upp'er end adapted to receive the lower end of the burner casing ring 5. The burner casing ring is provided with a pair of upwardly-projecting {iangcs 6 and 7 adapted to receive the outer vand inner casing walls 8 and 9, supporting them and retaining them in spaced relation to each other to form a suitable air chamber between them.

The walls 8 and 9 are provided with shouiders 10 and 11, respectively, at their up er ends, adapted to receive the downwardrl). projectingr flanges 13 and 14 of the casin top 12. he casing top 12 is providedwit a central opening about which is an upwardly-projecting {iange 15 for the v'nt pipe 16. The vent pi e 16 is provided iv th suitable air inlets an with a downwar' A.yf iiaring hood17 about the same, the vent pipe thus being adapted-t0 serve as a ventilator,

. as well as a means for carrying away the roducts of combustion from 4the heater urners.

Within the casing, I provide the heating coils 18, 21 and 24. The coil 18 is made up of a plurality of helical coils, the inlet pipe 19 thereof-which is at its upper end-being connected to the water valve casing; and the discharge pipe 20 at its lower end being connected to the header 27, to which the inlet pipes 22 and 25, respectively, of the heating coils'21 and 24 are connected. The discharge pipes 23 and 26 of these heating coils arp connected to the delivery pipe 28. The coils 21 and 24, are reierably single helical coils, the upper coil being inverted.

The delivery pipe 28 is connected to the supply pipe 2? of the house system, ot

which 30 represents the return pipe. When the house system includes a storage tank as Il] the return ipe 3() is connected thereto. The tankl is a so preferably connected to the supply'pipe 29 of the house system by the pipe .'52, W lich is provided with a suitable valve, The tank is connected by the pipe 34 to the circulation passage 43 of the water valve. The 'pipe 34 1s preferably provided with a suitable valve, as 255. In systems where no storage tank is rovided, the return pipe4 is connected direct y to the circulation passage 34 ol the valve. rlhe pipe 36 represents thc cold water supply, and this pipe is preferably provided with a valve, as 37.

3S represents the gas supply pipe, which is provided with a suitable valve, as 39.

The valve` mechanism preferably consists of the water valve casing 40 (see Fig. 4) having the supply passage 4l to whici the cold water supply pipe 36 is connected, the circulation passage 43 to which the pipe 34 is connected, and the discharv'e passage 42 to which the inlet pipe 19 of the heating coil is connected. These passages in the valve casing are controlled by the inlet valve 44 which is preferably of the piston type, it being arranged in the chamber 45 of the casing. The chamber 45 of the valve casing is enlarged so that when the valve is moved inwardly the valve is opened.4

The valve is guided by suitable ribs 46, s'o that it moves freely in the casing. O'n the inner cnd of the valve 44 is a valve 47 adapted to control the circulation passage 43. The valve 47 is provided with orts 48 which arc arranged to be open w en the piston valve is in its closed position, and closed when the piston val' 1s open, thus opening the circulation passa 'e when the water inlet valve is closed an closing the same when the Water inlet valve is opened. This allows the water Ito circulate through the heater for maintaining the temperature in the tank or in the system at a prede,- termined point; but, as soon as the pressure in the system is released,'by the drawing ot et Water, the inlet valve 44 is automatically opened, allowing the watcrto pass from the supply pi e into the heating coils. The opening o the inlet valve closes the circulation valve so that it is impossible for the water, owing tothe pressure in the su ply pipe, to pass into thc tank system wit out first' passing through the heater. When the drawing of the water from the system ceases, the water inlet valve is closed by means of the return spring 49. The valve 44 is ro-` vided With a suitable stem, as 50 whic is arranged through the inner end oi2 the valve casing. i

The gas supply pipe 439 is connected to the inlet chamber 53 in the gas valve casing 51. This chamber is connected by the port 55 tp a gas delivery chamber 54, the connecting port being controlled by the valve 56. The

chamber 54 is in turn provided with a delivery passage 57, which is controlled by the valve 58. The assage 57 is connected by' the pipe 59 to t 1c gas delivery ring 60, to which the burners 62 are connected. The pipe 59 is preferably provided with a valve 61. lhc valve chamber 54 is connected by the pipe 63 to the gas delivery ring 64, to which the burners 65 are connected, the barriers thus being divided into two groups supplied by independent connections of ia ve. The pipe 63 is preferably provided with a valve 634 so that the delivery of the gas to either the burners 62 or 65 maybe cut ofi' entirely, if desired by means of these valves 61 and 63. y

The pilot burner 67 is connected by the pipe 66 to the valve chamber 53; see Fig. 5. This mechanism is adapted to control the delivery of the gas through these pipes 59 and 63 so that either of the groups of burners may be supplied or both of them cnt off, as may be required. The delivery 'of the gas to the gas delivery pi e 59 is controlled b the valve 58, and t is valve is controlle by the Water inlet valve 44. This I preferably accomplish b roviding the va ve 58 with a stem 68, w nih is arranged throu h the inner end of the valve casin 51 and a aptedto be engaged by the stem 5% of the water inlet valve so that, when the water inlet valve is opene it 0 ens the asrvalve 58. The gas valve 1s he d normay in its seat by the return spring) 69. By this arrangement, thegroup of urners 62 is onl in use when the Water inlet valve is opone i as occurs when water isbein drawn from the system, .as above explained.

The valve casings 40 and 51 are preferably connected by a suitable yoke, as 52.

To provide a convenient means forv as semblin'g the parts, the Water and gas valve casings are provided with caps 72 and 78, res ectively, which may be readily taken, oilz an the valves removed from the casm The valve stems are provided Awith suitab e packing glands, as 74.

The gas valve 56 for controlling the connccting port 55 (se Fig. 3) for the gas ihlet uhm'iber 53 'and the gas discharge chamber 54 ci' the valve casing is provided with 1a tubular stem 75, having-{a} rod 76 adjustably` threaded therein. Therod 76 of the valve stem projects into the chamber 54Std be controlled by the thermostat, as will fully appear asthe description proceeds.' l

The valve 56 is guided in its movementby means ofthe pins 77, which reci recate in suitable holes 78 rovided there or' in the ca 79 for the in Vet chamber 53. The gas in et valve chamber' 523` is formed in the cap 80 of the ,valve casing@ The valve stem-75 of the valve 56 reciprqcates throu h the top of the cap 79 and is inclosed by t ie cap 8l. i so that it is easily 'accessible for purposes of 'lll lll

lill) adjustment, and thereby regulates the action of the thermostat on the valve. The thermostat preferably consists of the fixed eX- ansion tube 82 arranged in the water deivery pipe 28, the upper end of the tube being secured by the coupling member Brito the valve casing. Secnr 1d to the lower end of the tube is' a rod 84, the upper end of which engages the lever 86. The lever 86 is fulcruined on a suitable bearing 8T provided therefor. The bearing ST is carried by an ad'ustable plug 88 arranged through thc valve casing; see Fig. 3. The lever 81' is arranged to engage the lever 89 which is t'ulcrumed on a suitable bearing 90. This bearing is carried by the adjustable plugr tll arranged through the top of the. valve vasing. The lever Bt) engages the vlower end of the rod 7G of the stem of the valve 56. The therniostat lever 8G is provided with a suitable bearing point J2 for the lever 89. Thus arranged, hot Water in the discharge tube acts upon the expansion tube 82 expanding the same and thereby closingr the. valve 5G.

The valve casing 5l is provided with suitable caps 93, at each end. so that it may be readily opened, and thereby render the parts of the thermostat fully accessible.

ll'hen the temperature of the water passing through the delivery pipe reaches the predetermined point, the valve .Sti is closed, thereby cutting ott' the supply of gasto the delivery chamber 54 ot the valve casing. However, as soon as the temlwrature of the water falls, the valve 513 is opened and gas is supplied to both I 1;i'oups of burners in the, event that the-water inlet valve is open, or to the burners ($5 only should the inlet valve be closed.

ln the event that it is desired to use only the automatic water controlled gas valve, the valve o3 in the gas deliveryr p ipe (i3 may be closed; or, in case it should be desired to control by means of the thermostat onlyt 1 v automatically maintained by means ot the thermostat, the gas to the group ot burners o5 beingr controlled thereby, as stated.

.\s the water of the system is free to circulate through the heater, it is obvious that an even temperature is maintained. As soon, however, as thepressure in the system is reduced, as by the drawing ot of hot water,the water inlet valve is opened, at the same time opening the gas valve 58 and al- .lowing the gas to pass to the group of burn- Ycrs 62. This, of course, increases the heatp ing capacity of the heater, the burners remainingr lighted until the pressure is 'equalized in the system, and thereby closing the water inlet valve,`or until the temperature increases beyond the predetermined point, thereby cutting off the supply ,of gas to both groups of burners by means of the thermostat described. l am thus enabled to not only luaii'itain the temperature of the water in the system at a' uniform point, but am enabled to draw oil' a large volume of water ot' an approximately uniform temperature.

As stated, by arranging the heating coils as 1 ha\e illustrated and described. l au'. enabled to secure a very free and rapid circulation through the same. My improved heater is very effective in its utilization ot' heat units, and is therefore economical of the ,Las consumed. Also` it is obvious that, as the gas is cut ott' when the temperature reaches a predetermined point, the same is not wasted by the water in the system becoming overheated.

The parts are readily assembled and may be easily disassembled should occasion require.

l have illustrated and described my improved water heater in detail in the form preferred by me on account of its structural simplicity and economy and durability in use, l am, however-` avare that it is' capable of very great `variation in details of construction without departing;r from my invention, and l desire to be understood as claiming the saine broadly, as well as specilically, as illustrated.

H a ving: thus described my invention, what l'clailu as new and desire to secure by Letters Patent is:

1. lhe combination with a water heater, of a plurality of gas burners therefor arranged in two groups; a circulation system comprising a delivery and a return pipe; a eold 'water inlet or supply pipe; a water valve casinghaving an inlet iassage, a discharge passage. and a circulation passage therein, said water supply pipe being con nected to said inlet passage, said return pipe of said circulation system being connected to said circulation passage and said discharge passage being connected to said water heater; a water inlet valve; a circulation valve adapted to close said circulation passage controlled by said water inlet valve; a ,eras valve casing having an inlet chamber and a discharge. chamber therein, said discharge chamber having two discharge passages; pipes connecting said discharge passages to said lgroups of burners; valves in said connecting pipes; a gas inlet valve for controllingr the connectingpassage for said inlet and discharge chambers; a. thermostat arranged to control said gas inlet valve; a

fa Water inlet valve;

of`a lurality of gas burners therefor ranged in two groups; a circulation system comprising a delivery and a return pipe; a cold water inlet or supply pipe; a water valve casing having an inlet passage, a discharge passage and a circulation passage therein, said water supply pipe being connected to said inlet passage, said return pipe of said circulation system being connected to said circulation passage and said/discharge passage being connected tof" said water heater; a water inlet valve; a'circnlation valve adapted to close saidlcirculation passage controlled by said water inlet valve; a gas valve casing having an inlet chamber and a discharge chamber therein. said discharge chamber having two4 disA charge passages; pipes connecting said dis charge passa es to said groups of burners; valves in said connecting pipes; a gas inlet valve for controlling the connecting passa for said inlet and discharge chambers; a thermostat arranged to control said gas inlet valve; a discharge valve for controlling one of said discharge passages of said discliai'gn chamber; and connections for said discharge valve to said Water inlet valve whereby said dischar e valve is opened by said water valve, or the purpose specified.

The combination with a water heater, of a plurality of gas burners therefor arranged in two roups; a circulation system comprising a eliVery and a return pipe; a cold water inlet or supply pipe; a water valve casing having an inlet passage, a discharge passage, and a circulation passage therein; said Water supply pipe being connected to said inletpassage, said return pipe ot? said circulation system being connected to said circulation passage and said discharge passage being connected to said water beater; a circulation valve )adapted to close said circulation pasaigicri controlled by said Water inlet valve; a gas valve casing having an inlet chamber and a discharge chamber therein, said dischargei chamber having two discharge passages; pipes connecting said discharge passages lo said groups of burners; argus inlet valve ,for controlling the connecting passage tor sind inlet and discharge chambers; a thermostat arranged to control said gas inlet valve; a discharge valve for controlling one of said discharge passages of said discharge chainber connections for said discharge valve to said Water inlet valve whereby said dis charge valve is openedby said water valve; and a pilot burner connected to said inlct chamber, for the purpose specified.

4. The combination with awater heater;y of a plurality of gas burners therefor arranged in two roups; a circulation system comprising a elivery and a return pipe; a cold later inlet or supply pipe; a Water valve Casing having an inlet passage, a discharge Y. d water ysupply pipe being connected to aid inlct passage, said return pipe of said circulation svscni being connected to said circulation p:is.--:ige and said discharge passage being connected to said water heater; a water inlet valve; circulation valve adapted to close said circulation passage controlled by said water inlet valve; a gas valve casing having an inlet chamber and a discharge chanibcr therein; said discharge chamber haring two discharge passages; pipes connecling .said discharge passages to said groups of burners; :i gas inlet valve for controlling the connecting passage lier said inlet and discharge chambers; a thermostat arranged to control said inlet valve; a

i discharge valve for controlling one of said discharge passages of said discharge chainbcr: and connections for said discharge valve to said water inlet valve whereby said discharge valve is opened loY said water valve, for thc purpose specilied.

The combination with a water heater, ci' a plurality of gas burners therefor; a circn lation system comprising a delivery and a return pipe; a cold water inlet or suppliy pipo; :i water valve casing having an inlet passage, a discharge passage and a circula tion passage therein; said Water suppl y pipe being connected to said inlet passage; said.`

return pipe of said circulation system. being connected to said circulation passage and said discharge passage being connec i to said Water heater; a water inlet valve; a circulation valve adapted to close said circulation ssagc controlled iciv said4 Water inlet val gas vulve casing having two dis charge passa xs; valved connections for said discharge liiassages lo `id g is burners; :i gas inlet valve' a tlicrniclat adapted to contini said gis inlet valve; a discharge valve for controlling one of said discharge passages oi said dischargey chamber; coiinec` tions for said discharge valve to said water inlet valve whereby said discharge faire is opened by said water valve' and a pilot burner, for the purpose speciiiedi il. The combination with a water licatenof a plurality of gas burners therefor; a circir lation s vstein coni )rising a delivery and a return pipe; a cold water inlet or supply pipo; a water valve casing having an ir t passagi; a discharge passage; and a cir@ 4 tion passage therein, said Water supply pipo being ronnectcd to said inlet passage, said return pi e of said circule .n system being connecte to said circnlatnm passage and said discharge passage being connected to said water heater; a water inlet valve; a circulatii'in valve adapted to close said circulation passage contro led by said Water inlet valve: a gas valve casing having two discharge passages; connections for said discharge passages to said gas burners; a gas passage; and a circulation passage ilnyrciii;

inlet valve; a thermostat adapted to control said gas inlet valve; a discharge valve for controlling one of said discharge passages of said dischargeiehamber; connections tor said discharge valve to said water inlet valve whereby said discharge valve is opened by said Water valve; and a pilot burner, f'or the purpose specified.

7. The combination with a water heater. of a plurality of gas burners therefor; a circulation syst/ein; a cold Water inlet valve; a circulation valve adapted to control the return pipe of said circulation system arranged to be controlled by said Water inlet valve: a gas valve casing having an inlet chamber and a discharge chamber therein, said discharge chamber havingtivo discharge passages; valved connections for said discharge passages to said heater burners; a gas inlet valve for controlling the connecting passage of said inlet and discharge chainbcrs; a thermostat arranged to control said gas inlet valve; a discharge valve for controlling one of the said discharge passa res off said discharge chamber; connections or said discharge valve to said Water inlet valve, wherhy said discharge valve is opened by said 'atei' inlet valve; and a pilot burner connected to said gas inlet chandler, for the purpose specified.

8. The combination with a water heater, ot' a plurality of gas burners therefor; a circulation system, a cold water inlet valve; a circulation valve adapted to control the return pipe of said circulation system arranged to be controlled by said water inlet valve: a gas valve easing having an inlet chamber and a discharge chamber therein, said discharge chamber having two discharge passages; valved connections for said discharge passages to said heater burners; a gas inlet valve for controlling the connecting passage of said inlet and discharge chambers; a thermostat arranged to control said gas inlet valve; a discharge valve for controlling one of the said discharge passages of said discharge chamber; connections fior said discharge valve to said water inlet valve, whereby said discharge valve is opened by said water inlet valve; and a, pilot burner, for the purpose specified.

9. The combination with a water heater, of a plurality of gas burners therefor; a circulation system; a cold Water inlet valve; a circulation valve adapted to control the return pipe of said circulation system arranged to bc controlled by said water inlet valve; a gas valve casing having an inlet chamber and a discharge chamber therein,`

said discharge chamber having two discharge passages: connections for said discharge passages to said heaters: a gas inlet valve for controlling the connecting passages of said inlet and discharge chambers: a thermostat arranged to control said gas inlet valve; a

discharge valve for controllin one of the said discharge passages of said discharge chamber; connections for said dischar e valve to said water inlet valve, whereby sald discharge valve is opened by said Water n inlet, valve: and a pilot burner connected to said gas inlet chamber, for the purpose specified.

10. The combination with a water heater, of a plurality of gas burners therefor; a circulation system; a cold water inlet valve; a circulation valve ada ted to control the return pipe of said circn ation system arranged to be controlled by said water inlet valve; a gas valve casing having an inlet chamber; and a discharge chamber therein, said d` charge chamber having two discharge pdgsages; connections for said dischargeipassages to said heater burners; a gas inlet valve for controlling the connecting passage of said inlet and discharge chambers; a thermosta't arranged to control said vas inlet valve; a discharge valve f or controlling one of the said discharge passages of said discharge chamber; connections for said discharge valve to said inlet valve, whereby said discharge valve is opened by said Water inlet valve; and a pilot burner, for the purpose specified.

ll. The combination with a Water heater, of a plurality of gas burners therefor; a circulation system comprising a delivery and a return pipe; a Water inlet valve; a circulation valve adapted to control said return pipe of said circulation system arranged to be controlled by said water inlet valve; a gas valve casing having two discharge passages; valved connections for said discharge passages to said heater burners; a gas inlet valve; a thermostat adapted to control said gas inlet valve; a discharge valve for controlling one of said discharge passages of said gas valve casing; connections for said discharge valve to said water inlet valve whereby said discharge valve is opened by said water inlet valve; and a pilotburner, for the purpose specified.

12. The combination with a Water heater, of a plurality of gas burners therefor; a circulation system comprising a delivery and a return pipe; a water inlet valve; a circulationvalve adapted to control said return pipe of said circulation system arranged to be controlled by said water inlet valve; a gas Valve casing having two discharge passages; connections for said discharge passages to said heater burnen; a gas inlet valve; a thermostat adapted to control said gas` inlet valve; a discharge valve for controlling one of said discharge passages of said gas valve casing; connertions for said discharge valve to said water inlet valve whereby said discharge valve is opened by said water inlet valve: and a pilot burner, f'or the purpose specified.

los

l. Il

13. The combinat iongvith a Water heater, of a plurality of burners therefor; a water inlet valve; a gas valve casing having two discharge passages; valved connections for said discharge passages-to said heater burners; a gas inlet valve; a thermostat adapted to control said gas inlet valve; a discharge valve for controlling one of said discharge passages of said gas valve casing; connections for said discharge valve to said water inlet valve whereby said discharge valve is opened by said Water inlet valve; and apilot' burner, for the purpose specified.

14. The combination with a water heater, of a plurality of gas burners therefor; a wal ter inlet valve; a gas valve casing having two discharge passages; connections for said discharge passages to said heater burners; a gas inlet valve; a thermostat adapted to control said gas inlet valve; a discharge valve for controlling one of said discharge passages of said as valve casing; connections for said disc large valve-to said water inlet valve whereby said discharge valve is opened b said water inlet valve; and a pilot burner, or the purpose specified.

15. The combinatlon with a Water heater, of a plurality of gas burners ther for; a circulation system com rising a de ivery and a return pipe; a col water inlet or supply pipe; a water valve casing having an inlet passage, a discharge passage, and a circulation passage therein, said water supply pipe being connected to said inlet passage, said return pi e of said circulation system bein connect to sid circulation passage and said discharge passage being connected to said water heater; a water inlet valve; a circulation valve adapted to control said circulation passage, controlled by said wat/er inlet valve; a thermostat arran ed to be controlled by the water in the de ivery pipe of said circulation system; a pair of gas valves for controlling said burners one of which is adapted to be controlled by said thermostat and the other bv said water inlet valve, the valve controlled by said thermostat being arranged to control the delivery of gas to the valve controlled by said Water inlet valve; and a pilot burner.

16. The combination with a Water heater, of a plurality of gas burners therefor; a circulation system com rising a delivery and a return pipe; a col water inlet or supply pipe; a Water valve casing having an inlet passage, a discharge passage, and a circulation passage thereVV wsaid water supply Alpipe being connected tofsaid inlet passage, said return pipe-of said circulation system being connected to said circulation passage and said discharge passage being connected to said Water heater; a water inlet valve; a circulation valve adapted to control said circulation passage, controlled by said water inlet valve; a thermostat arranged to be of said controlled by the vvaterin the delivery pipe of said circulation system; a pair of gas valves for controlling said burners, one of which is adapted to be controlled by said thermostat and the other by said Water inlet valve; and a pilot burner.

1T. The combination with a Water heater, of a plurality of gas burners therefor; a circulatwn system; a water inlet valve; a circulation valve ada ted to control said return ipe of said` circulation system arranged to lie controlled by said water inlet valve; a thermostat; a pair of gas valves for controlling said burners, one of which is adapted to be controlled by said thermostat and the other by said water inlet valve, the valve controlled` by said thermostat being arranged to control the delivery of-Uas to the valve controlled'b said water inlet valve; a pilot burner; an valves for cutting o' the delivery of gas to said burners from either as valves.

r 18. T e combination with a water heater, of a plurality of gas burners therefor; a circulation system; a Water inlet valve ;a circulation valve ada ted to control said return ipe of. said circu ation system arranged to be controlled by said water inlet valve; a thermostat; a pgir of gas valves for controlling said burners: one of which is adapted to bev controlled by said thermostat and the other by. said water inlet valve; a pilot burner; and valves for cutting oil' the delivery of gas to said burners from either of said gas valves. i

19,v The combination `lii'th a water heater, of a plurality of gas burners therefor; a water inlet valve; a thermostat; a pair of; gas valves for controlling said burners, one of which is adapted to be controlled by said thermostat and the other b said water inlet valve, the valve controllo by said thermostat being arranged to control the delivery of gas vto the valve controlled by said water inlet valve; a pilot burner; and valves for cutting olf the deliver of gas to said burners from either of sai gas valves.

E20.` The combination with a water heater, of a plnralityof gas burners therefor; a water inlet valve; a thermostat; a pair of gas valves for controlling said burners, one of which is adapted to be controlled by said thermostat and the other by said water inlet valve; a vpilot burner; and valves for cutting` olf the delivery of gas to said burners from either of said gas valves.

2l. The combination with a Water heater, of a plurality o gas burners therefor: a circulation system; a Water inlet valve; a circulation valve adapted lo control said return pipe of said circulation systcn; arranged to be controlled by said water'inlet valve; a thermostat a pair of gas valves for controllinel said burners, one of which is adapted to bc controlled by said thermostat and the llt)- other by said inlet `Water valve, the valve controlled b said thermostat being arranged to control t e delivery of gas to the valve controlled by said Water inlet valve; and a pilot burner.

QQ. The combination with a Water heater,

of a plurality of gas burners therefor; a rirculation system; a Water inlet valve; a circulation valve ada ted to control said return pipe of said rircu ation system arranged to we controlled by Said Water inlet valve; a thermostat; a pair of gas valves for controlling said burners, one of which is adapted to be controlled by said thermostat and the other by said water inlet valve; and a pilot burner. f

23. The combination with a water heater, ot a plurality of gas burners therefor; a water inlet valve; a thermostat; a pair of gas valves for controlling said burners, one of which is adapted tobe controlled by said thermostat and the other by Said Water inlet valve, the valve controlled by saidthermostat being arranged to control the delivery of gas to the valve controlled by saidwater inlet valve; and a pilot burner.

Q4. The combination with a water heater, of a plurality of gasburners therefor; a water inlet valve; a thermostat; a pair of gas valves for controlling said burners, one of which is adapted to be controlled by said thermostat and the other by said weten inletA valve; and a pilot burner.

25. The combination with a. water heater ot' a plurality of gas burners therefor; a water inlet valve; a thermostat; a pair of gas valves for controlling the said burners; one of which is adapted to be controlled by said thermostat and the other by said water inlet valve, said thermostat being,r also adapted to control the delivery of gas to said gas valve controlled by said water inlet valve.

26. The 'combination with a water heater, of a gas burner therefor; a gas vulve for said burner; a thermostat connected to said water heater adapted to control said gas valve; an automatic wat/er inlet valve; and a circulation valve controlled by said Water inlet valve, said circulation valve being adapted, when open, to permit the water to circulate throu h the heater and thermostat.

27. The comination with a water heater, of a gas burner therefor; n gas valve for said burner; a thermostat connected to said water heater adapted to control said gas valve; and an automatically controlled circulation valve, said circulation valve being adapted, when open, to permit the Water to circulate through the heater and thermostat..

28. The combination with a Water heater, of a thermostat connected thereto; an automatic 'water inlet valve; and a circulation valve controlled by said water inlet valve, said circulation valve being adapted, when open, to permit the water to circulate throu h the Water heater and thermostat.

29. he combination with a Water heater 'of a thermostat connected thereto; a water -let' is closed, said valve being adapted, when open, to permit the Water to circulate through the heater and thermostat.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

ummra'r s. waarnaar. lt. a]

Witnesses:

LULU GREENHELD, Gnu'rnnna TALLMAN. 

